How to access Fundamental Sample Time value within a simulink model

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Douglas
Douglas 2012-11-27
评论： Leonardo 2023-3-27
I have a model will run fixed step discrete. Some of the subsystems I must use require the value of the fundamental step time as an input.
The quick version is, of course, to use a constant as an input and set it equal to the value of the fundamental sample time that's input in the configuration parameters.
And, of course, this method is an invitation to subtle bugs when the configuration parameter is changed but someone forgets to change one of the constant blocks to match.
So - is there a way to simply pull in the value that's been set within the configuration parameters?
Thanks.

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Vishal Rane
Vishal Rane 2012-11-28
编辑：Vishal Rane 2012-11-28
SampleTime = get_param(MdlName,'FixedStep')
gives you the Fixed-step size (fundamental sample time) as specified in Simulation > Configuration Parameters.
You could also use this inside a model callback (startfcn) to ensure that value is present in the base when the model is simulated.
Refer Link for more information.
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Dana Schwanke
Dana Schwanke 2022-6-27
This doesn't seem to work for Stateflow. I am trying to access the Stateflow chart's discrete Sample Time for part of a state's during: section. Any way I can do this?
Leonardo
Leonardo 2023-3-27
Hi Dana!
I am having the same issue as you, could you find a way to do what you are asking here?

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Babak
Babak 2012-11-27
In Simulink Library Browser, go to the Simulink, Signal Attributes, section. There is a block called Weighted Sample Time.
That's what you can use to multiply any signal with it to get Ts.
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Douglas
Douglas 2012-11-28
Not quite what I need - the block wants a constant input equal to "dt" -- but I suppose I can fake this by using the weighted sample time with a unit input.
Just surprised there isn't a way to access this as an "environment-ish" variable.
Babak
Babak 2012-11-28
Simulink is based on blocks and signals. I don't think there is any pre-defined, and system set up variable like Ts that you can just simply write it anywhere in any block and use it that way. I think the only solution is what you said, just connecting a unit step or 1 constant source to the Weighted sample block.

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